wuyi created SPARK-30151:
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             Summary: Issue better error message when user-specified schema not 
match relation schema
                 Key: SPARK-30151
                 URL: https://issues.apache.org/jira/browse/SPARK-30151
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 3.0.0
            Reporter: wuyi


In DataSource.resolveRelation(), when relation schema does not match 
user-specified schema, it raises exception and says that "$className does not 
allow user-specified schemas."  However, it does allow user-specified schema if 
it matches relation schema. Instead, we should issue a better error message to 
tell user what is really happening here, e.g. clarify the mismatched fields to 
user.



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